Amid the economic crises to which the Rio Olympics gave rise, the city’s revitalized harbor area stands out as a positive legacy of the games. It was run-down for at least a half-century, but now the port has been restored and revived via a project that involved pulling down an overhead expressway and opening up old military zones to the public. The resulting space includes a new promenade featuring a center-lane streetcar whose terminus is the city’s new aquarium. Along the route, there are new museums and scads of street art. While the district’s physical aspect has been transformed, its African heritage remains in place at the Pedra do Sal, the old samba ring that’s still an electric Rio nightlife landmark.